Right-angle undercutter



Nov. 15, 1949 J. w. MccLE p 2,487,935

RIGHT ANGLE ummcuwwsfi I Filed Sept. 5, 1947 I 3 Sheets-Sheet 1 1949v J. w M CLENDON RIGHT ANGLE UNDERCUTTER 3 Sheets-Sheet 2 Filed Sept. 5, 1947 I lu'enllu' awe W/v' czendm A no ru eys Patented Nov. 15, 1949 PATENT OFF! CE mamew UNDEIEQUHER Jesse'W. Mcfilendonjflampa, ,Ela.

V fllpplioaltionkSe itemher 5, 1,9451, Sez'ialzNn. 7323352 he present inventien irelates {to undencnttine machines and it consists in =.the nominations, tconstrnetions and arrangements iQ smarts herein de ribediand claimed.

It r biect 5 of*th ;-p :esent invention hmrovide :a machine :for undercutting the insulation between th segm nts cQf the cemmutaters 101 inotorrsfandeneratcrs.

:A t r ob e o :ihe :zinve-n ion :i the inro- Mis Qn-nf means, in a ma hin 501" this 1charaetcr, in pr vid n ifQ dercuttin in a verti al or horizontal direotiqn at the will of hBEOpQmtIQ andw h:a'in nimumofa mleneededtor-changin r mcon txpelqfunde u t ngitoithenther Another object of th i ention the proyisi n fo nav l means and m ohanisms .r or the m unting of ;-a meter 01' enerator ear-mature :in th rmaohine.

Another object gfethesinventionzis thenmvision of -noveltmeans ansirm hanism for adj stin zand limiting the linear rmovement Qf a saw utilized ntheinwenti nher.an wiurtherfohie rofithainventiomwiil become ianpanent :from a :nea ing 10f ethe ziollowing eeinea ion -,taken :in yconiunqtion w th {the drawin flinwh chz I V Fi ure 1 is a p n vi .qf-ansemhed menttof the invention,

Figu e is si e e1 Ya n 1 w ztsh iseoi,

Figure 1 is a mm e evational vi wrof the inmention,

.Ei ure 4 is -a rs qtiqnal view taken along .iine ed-o igure i ure 1 s a if-raem ntar d iel vaitional Mew taken rom p o .te side to that shown :in 5

fi ural ur :6 is a en arged qfrasmenta ycsectional ew -tak n subst iallyalonsdinewfi fi fiF-i'gurze rand F ure 7 is afperspe tiveeview ofam kmentsof the invention. 7

tiswel -kn wn that i esq mmutator segments inihe a m turesoffg ne atqrendistarter motors for automobiles as at present -,ccn's truct.ed sin v riably El paralle to the arma re shaft while in other :fields sneh -as -refrig eration:and the like h c mmut e segments 5116 n -m ane at ri ht angles to the axis of th feommutatenshait.

The present nve t e compr ses :a machine adapt dt oiunds acutitheinsu ation usua iysnica, beneath s ch vs ei el ts A :1 in dose Quin-lib and es. y .aden ed to ehanee the nndemuttin efn t ee wmmuta ztpamther. V .iie e ng t en er :a moresnmnzete imrder" iihe invent en $9 the six-swings, Ethel-1Q leClaims. (Cl. RD-I2) 2 isshovmthereineanzundercuttingrmaohinehaving a :base A0 of hollow construetion adjacent :the front end of which risafiixed.a qventicaliysextendh s support .;II ,in which :is esiidahiy mounted a .oylindrical ooolumn I2 ,to the .upper endof which is afiiXed Lahorizontal sunportingmember 13in the forward .end QfwhichJs aifixedaguideltuhmg lfiwhavir gaooliar ,lhatitszunnertendlipon which 'r'eststhe hub -I 6 of a handle".

Dependant irom the hub 16 .and extending through the tubing L34 is arod I8. .Ifhe dinner I end of th support If I is provided with a 01- Wardly extending integrally :formed dog 1L9 through which thetubing ;I4 is adapted ,to pass. An ganehoringdog'n is alsoi'formed in'the support '1] below *th'e'dog f9 and serves as an anchoring base for-a nutplate' zil having a dependant collar 21a through which the rod I8 "is threadedand which is provided 'wit-h-za s'lo'tfl "at 'ither'sidefin Which-may be engaged thumb nuts 23 carried by bolts 24 pivdted,- asindicatedat 25,jco theianohor- -ingdog 211. When-the rod H3 isin lowered position, it depends into the base through a smooth pe'ningin the'da'tter. "In *the rear endof =the Supportingmeniber 13 is remov'afldly mounted, *by means *of a pair of 'set screws 26, ac'utter head assembly Adjacent the rear end 6f the base *PO is provided a transversely "extending su port 28 450* one end of whieh is 'pivo'tally moun'ted, as indicated at 2 9,--an 305120 which is afl'ixed-aiforwardly extending lever 3| having ahandle 3 2 and interconnected with ithe 'supportingmember by a lin-k33.

iReferring to Figure 6 particularly, it will E'b'e seenfthat thecutter =headassen 1b1-y 2-1-comprises a housing: 34 in which is mounte'd a spindl'eishait 'a'fi by means of bearings 36 and 31. The shaft is provided with :a 'head 38 in '-Whioh is removalbly mounted by means toT :a set screw 39 a imandrel flll wh-ichimam oi course be oharrg'ed as desired to one 40f lesser :or greater length. it the outer end :of thelman'drel is mounted 'azsaw' l l -by'=means of a .screw 42. The s'ha'ft 35 has adjus'talbly mounted :thereon a pu1 1ey 43 by means of a set screw flland a coilar 45 is interposed between the bearing 36 and pulley and is provided with a pair of diametrically apposed laterally eXtend-in'g compression springs 46 adapted to bear against the pulley 43 to take *up play whenever end drift maysoccur in the' assembly anwbefore the same is taken -.up by resetting ithe positi'on of the pvllley 43' by :means oflthe set screwlll.

' :e'lectric meter m' is mounted upon a platform #8 amazed to the rear end of the base by screws 49 or the like and is provided with a pulley 58. A suitable switch 5| is provided in the forward end of the base I8 for controlling the operation of the motor 41.

Adjacent the support 28 is affixed to the base H] a supporting member 52 in which is pivoted, as indicated at 53, a forwardly extending arm 54, the outer end of which carries an idler pulley 55. A belt 56 is trained over the pulleys 43, 59 and 55.

A pair of longitudinally extending carriage rods 51 and 58 have their ends mounted in the supports II and 28 and slidably mounted upon the rods 51 and 58 is a carriage 59 in which is pivotally and slidably mounted a cylindrical longitudinally extending column 6|] to the forward end of which is afiixed an upwardly extending arm 6|. A like arm 62 is afiixed to a collar 63 which is slidably engaged upon the column 68 and is provided with an opening for the reception of a guide rod 64 affixed in parallel relation to the column 68 in a dependant dog 65 carried at the rearward end of the column 68.

The axial position of the arm 6| may be varied by means of a hand screw 65 mounted in the carriage 59 and adapted to lock the column 69 in selected positions and a like screw 61 is also provided for locking the carriage 59 with respect to the rod 51.

The upper end of the rod 6| is provided with a seat 68 having a stem 69 adjustably mounted therein by means of a screw 19. The arm 62 has slidably mounted in its upper end a rod 1|, the rearward end of which carries an operating handle 12 and the forward end of which ha aflixed thereto a seat 13. A compression spring 14 is interposed between the seat 13 and the arm 62.

An adjustable stop member 15 is slidably mounted upon the rod 51 between the carriage 59 and support II and is provided with a hand screw 16 for locking the same in selected positions.

A dependant bracket 11 mounted in the hollow base l8 has journaled therein a shaft 18 which protrudes through the side of the base I8 and carries on its outer end a lever 19 having a handle 89. The inner end of the shaft 18 has afiixed to it by means of a screw 8|, an arm 82 which extends upwardly through a slot 83 in base and has its upper end interconnected with the carriage 59 by means of a link 84.

In operation, it will be apparent that to undercut a commutator having longitudinally extending segments as, for example, that Shown in Figures 1 and 2, at 85, the shaft of the armature will be placed in the seats 68 and 13 and the carriage 59 will then be brought forwardly by means of the lever 19 until the commutator registers with the saw 4|. The rod I8 is then turned by means of the handle H to move the cutter head assembly 21 downwardly until the saw almost touches the commutator. The armature is then revolved until insulation is directly beneath the saw. The motor 41 is then started by means of the switch 5|. The handle I1 is then turned until the saw cuts into the insulation a sufiicient depth, usually .025. The lever 19 is then utilized to bring the carriage 59 forwardly until the cut in the insulation has been extended as far back on the commutator as is desired. The stop 15 is then looked in position upon the rod 51 adjacent the carriage 59 by means of the hand screw 16. The lever.19 is then reversed until the commutator is clear of the saw, thereby completing the first circuit. The armature is then revolved until the next insulation is in line with the saw and the lever 19 is now worked backwardly and forwardly to complete a second circuit. This operation is continued until all of the insulations are cut.

To undercut a commutator having its segments aligned at right angles to the axis of its shaft, as shown in Figure 5, for example, the shaft is placed upon the seats 68 and 13 and the carriage 59 is brought forward by means of the lever 19 until the commutator 86 almost touches the saw The armature is then revolved until insulation is directly in line with the saw. The motor 41 is then started by means of the switch 5| and. the carriage 59 brought forward with the lever 19 until the saw cuts to a suflicient depth. The carriage 59 is then locked by means of the hand screw 61 on the carriage rods 51 and 58. The handle I1 is then revolved until the cutter head assembly 21 is moved downwardly as far as desired. This is usually to the conventional annular groove adjacent the armature shaft. The nut plate 2| is then released from the anchoring dog 20 by loosening the nuts 23 upon the bolts 24 and revolving the bolts to a hanging position. The lever 3| is then moved upwardly until the saw 4| closes the outer periphery of the commutator thereby completing the first cut. The armature is then revolved until the next insulation is in line with the saw 4|. The lever 3| is then depressed until the anchor plate 2| comes into contact with the anchoring dog 29 which forms a positive stop for such downward cut of the saw. The lever 3| is then again brought up to clear the upper end of the commutator, thereby completing the second cut. Repeating the last operation after revolving the commutator to the successful insulation points is then in order to complete the job of removing the insulation from between the commutator segments.

While but one form of the invention has been shown and described herein, it will be readily apparent to those skilled in the art that many minor modifications may be made without departing from the spirit of the invention or the scope of the appended claims.

What is claimed is:

1. A device of the character described comprising a motor-operated saw, a carriage, means on said carriage for holding a work piece thereon, means for reciprocating the carriage and said work piece horizontally, means for adjusting and limiting said movement, means for reciprocating the saw vertically and means for adjusting and limiting said last-mentioned movement said means for reciprocating the saw vertically including a cutter assembly for the saw, a support for said cutter assembly, a base for the entire mechanism, a Vertical supporting member on said base, a cylindrical column vertically dependant from the support for the cutter assembly and slidably mounted in the vertical supporting member, a vertically dependant rod revolubly mounted in the support for the cutter assembly, a handle for turning the rod, a nut plate threaded upon said rod and an anchoring dog mounted upon the vertical supporting member for limiting the downward movement of the nut plate.

2. A device of the character described comprising a motor-operated saw, a carriage, means on said carriage for holding a work piece thereonJ means for reciprocating the carriage and said work piece horizontally, means for adjusting and limiting said movement, means for reciprocating g the saw vertically and means for adjusting and limiting said last mentioned movement said means for adjusting and limiting the horizontal movement of the carriage including a pair of rods, the carriage slidably mounted upon said rods, a hand screw threaded into the carriage and adapted to bear against one of the rods and said means for reciprocating the saw vertically including a cutter assembly for the saw, a support for said cutter assembly, a base for the entire mecha nism, a vertical supporting member on said base, a cylindrical column vertically dependant from the support for the cutter assembly and slidably mounted in the vertical supporting members, a vertically dependant rod revolubly mounted in the support for the cutter assembly, a handle for turning the rod, a nut plate threaded upon said rod and an anchoring dog mounted upon the vertical supporting member for limiting the downward.

movement of the nut plate.

3. A device of the character described comprising a motor-operated saw, a carriage, means on said carriage for holding a work piece thereon, means for reciprocating the carriage and said work piece horizontally, means for adjusting and limiting said movement, means for reciprocating the saw vertically and means for adjusting and limiting said last mentioned movement, said means for adjusting and limiting the horizontal movement of the carriage including a pair of rods, the carriage slidably mounted upon said rods, a hand screw threaded into the carriage and adapted to bear against one of the rods and said means for reciprocating the saw vertically including a cutter assembly for the saw, a support for said cutter assembly, a base for the entire mechanism, a vertical supporting member on said base, a cylindrical column vertically dependant from the support for the cutter assembly and slidably mounted in the vertical supporting members, a vertically dependant rod revolubly mounted in the support for the cutter assembly, a handle for turning the rod, a nut plate threaded upon said rod, an anchoring dog mounted upon the vertical supporting member for limiting the downward movement of the nut plate and means for locking the nut plate upon the anchoring dog.

4. A device as defined in claim 3 wherein the means for locking the nut plate upon the anchoring dog includes a pair of bolts pivotally mounted, at opposite sides of the dog, slots formed in the plate and nuts carried by the bolts for engaging the plate when the bolts are turned into the slots.

JESSE W. McCLENDON.

REFERENCE S CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 992,865 Fischer May 23, 1911 1,064,715 Dickenson June 17, 1913 2,372,304 Volzka Mar. 27, 1945 2,400,933 Johnson et al. May 28, 1946 

